I have seen both the Polish and Romanian guns currently in the surplus market. I have a Romanian, and, disappointingly, I didn't think the typical Polish fit and finish was any better. Both have kludged-on safeties for import. I kind of like the Romanian one better, but neither are fine examples of function or style. Be aware the Yugo, like many other things Yugo, is a bit different, with a longer grip which takes a different magazine, too, IIRC.
I have Yugo, Chinese, Romanian, Bulgarian, and commercial (Wolf) ammo. I like them in that order. I have not tried the Polish ammo on the market, as at least one distributor says to expect cracked necks
before you fire.
All the surplus but the Bulgarian is nice, shiny, sure-fire stuff. All the surplus stuff is corrosive, so remember the wind ex or Ballistic. The Bulgarian (that's the stuff SKAS Ray was thinking of with a bad rap a few years back) is cheap blasting ammo (well, it's all cheap), although occasionally some rounds require a second strike, and a number of the case mouths split after firing. Not that reloading is a big concern. The Yugo stuff is great stuff. The Chinese stuff is hard to come by. I jumped on a few thousand a couple of years ago (yes, before I had my T-33. [HM]). The Romanian ammo is available from AIM at $129/1224 rd tin, which stores nicely.
The commercial stuff (I have Wolf, but S&B also loads it commercially) is really nice, but at $19/50 ($38/rd) for FM, it's not in the same cheap-to-shoot class as $8.5/70 Yugo ($.12/rd) or even cheaper Romanian ($.10/rd). (I got my Bulgy at $.08/rd.)
Fun little guns. Very flat and compact, passable sights, and they make a nice bark, especially when shooting near dusk. Can't go wrong for the price of the gun and ammo, not these days. Good luck.